# ECG Notes vs QTc

The clearest difference is in-app purchases: QTc at none against ECG Notes's 1. QTc also leads on ads (none vs shown) and ratings volume (51 vs 12). ECG Notes's advantage is iOS requirement (13.0 vs 18.0). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. ECG Notes sells 1 one-off in-app purchase. QTc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for ECG Notes against 4.7 for QTc. Both are backed by a comparable volume of ratings — 12 and 51 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

ECG Notes ships an update every 3 months, QTc every 4 months. The most recent releases landed on October 21, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ECG Notes | QTc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (12 ratings)](https://appshunter.io/ios/app/ecg-notes-quick-look-up-ref/id1146393355/reviews) | **[4.7 (51 ratings)](https://appshunter.io/ios/app/qtc-calculator/id1354439139/reviews)** |
| Number of ratings | 12 | **51** |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 46 MB | 1 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Skyscape Medpresso Inc](https://appshunter.io/developer/818609416) | [Marian Stiehler](https://appshunter.io/developer/1354439138) |

## What reviewers say

### ECG Notes

[App page](https://appshunter.io/ios/app/ecg-notes-quick-look-up-ref/id1146393355)

This pocket guide offers a quick reference for ECG interpretation and management, covering basics, 12-lead ECGs, ACLS, CPR, and emergency medications. It includes over 100 ECG strips and practice questions, with content updated to the latest guidelines. No internet connection is needed after initial download.

**Highlights:** 125 ECG rhythm strips, Comprehensive coverage: basics, ECG, ACLS, PALS, meds, CPR, CPR algorithms in tabular format, Test Yourself ECG strips with real-life arrhythmias, Clinical Tips and PALS coverage, SmartSearch technology for quick look-up, Offline content access

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ECG Notes-Ed.4 | $34.99 | one-time |


### QTc

[App page](https://appshunter.io/ios/app/qtc-calculator/id1354439139)

This medical app calculates QTc using nine different formulas. It allows users to input heart rate or RR interval and QT interval length for quick results. An Apple Watch app is also included for convenient access.

**Highlights:** Nine QTc calculation formulas, Input heart rate or RR interval, Input QT interval length, Apple Watch app integration, No personal data collection, Offline functionality

**In-app purchases:** none


## Frequently asked questions

### Is ECG Notes free?

ECG Notes is free to download, with in-app purchases available.

### Is QTc free?

QTc is free to download, with no in-app purchases.

### Which has better reviews, ECG Notes or QTc?

QTc is rated higher. ECG Notes averages 4.7 out of 5 from 12 ratings, while QTc averages 4.7 from 51 ratings.

### Do ECG Notes or QTc have ads?

ECG Notes shows ads; QTc does not.

### Which is updated more often, ECG Notes or QTc?

ECG Notes ships an update every 3 months, and QTc every 4 months. Most recently, ECG Notes was updated on October 21, 2026 and QTc on October 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*